LEAD PRESENTATION

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LEAD PRESENTATION

  1. 1. CS109909-3 LEAD Max Wortman Period 5
  2. 2. CS109909-3 LEAD – 6P14 Electrons: 82 Neutrons: 125 Protons: 82 Atomic Mass: 207.2 Melting point: 327.6º C
  3. 3. CS109909-3 Basic Information  Lead is a basic group element with symbol “Pb” and atomic number 82.  Derives from Latin word plumbum  Lead is a soft, malleable poor metal.  It is also counted as a heavy metal.  A soft blue-grey metal  Lead, when exposed to air, turns to a dull, gray color.  Found in a natural environment.  Labeled as a “post-transition metal”  Still used in consumer products.  Such as paint and gasoline
  4. 4. CS109909-3 History  Lead has been commonly used for thousands of years because it is widespread, easy to extract and easy to work with.  The Romans had the largest lead mining economy in history.  Lead’s symbol “Pb” is an abbreviation of its Latin name “plumbum” for soft metals.  Unfortunately, no one knows who discovered lead.  There is evidence that the first discovery of lead was 9,000 years ago.
  5. 5. CS109909-3 How does lead get into the environment?  Deterioration of lead-based paint  Leaded gasoline  Lead mines or smelters 
  6. 6. CS109909-3 How are people exposed to lead?  Dust, paint, and/or soil  Contaminated food, water, or alcohol  Some imported home remedies and cosmetics
  7. 7. CS109909-3 Lead in home environments: bare soil porch windows doors walls tracked in Lead in dust • Pre-1978 homes with deteriorated leaded paint • Children at greatest risk • Most exposure through leaded dust in home
  8. 8. CS109909-3 How are people exposed to lead in work environments?  Swallowing lead dust  Breathing contaminated air  Lead contacting skin  Workers can expose their families if they bring lead home on their clothes or skin
  9. 9. CS109909-3 What jobs involve lead?  Lead smelting or mining  Construction/ remodeling  Automobile repair  Plumbing  Police officers/military  Many others
  10. 10. CS109909-3 Lead in drinking water  Lead can enter water by leaching from  Lead-containing pipes  Brass faucets  Solder  Boiling does not get rid of lead  Running cold water before use may reduce exposure
  11. 11. CS109909-3 Lead in commercial products  Lead is still used in products such as:  Bridge paint  Computers  Solder  Ceramic glazes  Jewelry  Automotive batteries  Imported or older pre- regulation products
  12. 12. CS109909-3 Lead in food products  Food or beverages may be contaminated through  Production  Packaging  Storage
  13. 13. CS109909-3 Effects of lead  No known threshold for effects of lead  Affects all organ systems  Developmental neurologic effects  Affects fetal viability, and fetal and early childhood development  Maternal lead may affect child’s neurologic development
  14. 14. CS109909-3 FIN
  15. 15. CS109909-3 FIN Max Wortman Period 5

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